You can save space and make sorting easier by stacking the small PLUGGIS recycling bin (2 gallon) on top of the large PLUGGIS recycling bin (4 gal). http://www.ikea.com/ca/en/images/products/pluggis-recycling-bin-white__0148421_PE306782_S4.JPGPLUGGIS Recycling bin, whitehttp://www.ikea.com/ca/en/catalog/products/80234707/802.347.07$15.99